Various updates to VOP_ATTRIB(9): mention locks being shared/exclusive for VOP_GETATTR() and VOP_SETATTR(), reference VOP_NULL() to suggest clearing all of *vap with it before setting specific values.  Cross reference VFS(9).  Indicate that failure modes are possible from VOP_GETATTR() and that an errno value is returned.
Various updates to VOP_ATTRIB(9): mention locks being shared/exclusive
for VOP_GETATTR() and VOP_SETATTR(), reference VOP_NULL() to suggest
clearing all of *vap with it before setting specific values.  Cross
reference VFS(9).  Indicate that failure modes are possible from
VOP_GETATTR() and that an errno value is returned.

Submitted by:	Hiten Pandya <hiten@uk.FreeBSD.org>

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase